Percent Change and Percent Error Practice

Front

What is percent change?

Back

Percent change is a measure of how much a quantity has increased or decreased relative to its original amount, expressed as a percentage.

Front

How do you calculate percent increase?

Back

Percent increase = ((New Value - Original Value) / Original Value) x 100.

Front

How do you calculate percent decrease?

Back

Percent decrease = ((Original Value - New Value) / Original Value) x 100.

Front

What is percent error?

Back

Percent error is a measure of how inaccurate a measurement is, expressed as a percentage of the true value.

Front

How do you calculate percent error?

Back

Percent error = (|True Value - Measured Value| / True Value) x 100.

Front

If a test score is predicted to be 70 and the actual score is 55, what is the percent error?

Back

Percent error = (|70 - 55| / 70) x 100 = 21.43% (rounded to 27%).

Front

A TV's price increased from $299 to $599. What is the percent increase?

Back

Percent increase = ((599 - 299) / 299) x 100 = 100%.

Front

The price of a sweater decreased from $45 to $36. What is the percent decrease?

Back

Percent decrease = ((45 - 36) / 45) x 100 = 20%.

Front

A tank of water starts with 12 gallons and ends with 8.4 gallons. What is the percent change?

Back

Percent change = ((12 - 8.4) / 12) x 100 = 30%.

Front

Emma needs 84 cm of ribbon but cuts 80 cm. What is her percent error?

Back

Percent error = (|84 - 80| / 84) x 100 = 4.76% (rounded to 5.0%).